im putting a k&n air filter onto my 2008 z400. do i need to re-jet? or can i just put it on and not re-jet? need answers quick, im putting it on soon

also, im getting a k&n oil filter onto my z400, so i need to do anything because of it?

thanks in advance!

 

No rejet needed unless you're pulling the lid too.

 

no rejetting needed unless you pull the lid like catman said or you pipe it at the same time

 

you dont need to rejet but if you go with the powerlid extreme from k&n it comes with a 160 mj and a 155 mj... i just did the same on my z big improvement